Door buzzer



Aug. 18, 1925..

I, B. SANDERS DOOR BUZZER Original Filed March 15. 1923 Patented Aug. 18, 1925.

TSTATES ERATENT Torrens. WORTH, TEXAS.

' ""DOOR BUZZER.

.- pp1icatidn fi1ed March 15, 1923, Serial 11012625,!36215; Renewed lune. 20;;1925.

To all whom it may concern:

Be it known that I, IRA B. SANDERS, a citizen of the United States, residing at Fort Worth, in the county of Tarrant and State of Texas, have'invented certain new and useful Improvements in Door Buzzers, of which the following is a specification.

My invention relates to signals or buzzers and more particularly to door buzzers; and the object is to provide simple and practical signaling or calling devices for use at doorsand other places. One object is to provide a simple device which can be operated by alternating currents of electricity. The object is to. provide a simple device which can be furnished at small cost and which will be highly efficient in givmg signals or alarms for various purposes. Other objects and advantages will be fully explained in the following descript on and the invention will be more particularly pointed out in the claims.

Reference is had to the accompanying drawings which form a part of this application.

Fig. 1 is a side elevation of the improved buzzer. Fig. 2 is a plan view of the same. Fig. 3 is a side elevation of a buzzer which is a variation in the design from the buzzer previously shown.

Similar characters of reference are used to indicate the same parts throughout the several views.

A base 1, preferably of non-conducting material, is provided and a casing 2 incloses the buzzer and is attached to the base 1. The poles 3 and 1 constitute the negative and positive poles. A plurality of strips 5 of metal are secured to the base 1 by a strap 6 which is secured to the base 1 by screws 7. The strips 5 are bent approximately L-shaped and extended up through coil 3 to form a core of said coil. The other ends of the metal strips are extended up through coil 4 to form a core of said coil. The metal strips, or part of the metal strips, are then bent substantially at right angles and extended to form a vibrating reed 10. An extension of the core in coil 3 forms a pole 11 which attracts and cooperates with the reed 10. A wire 13 enters the base 1 and goes into the coil A at 14 and after being wound into coil 4 leaves the coil and enters coil 3 at 15 and leaves this coil at 16 and is extended back through the base 1. A set screw 12 is used to bear on the reed 10 to vary the volume or extent of the vibrations, thus by adjusting screw 12 the reed or vibrating core or buzzer 10 can be made to vibrate with stronger strokes.

In operation, when the current is turned into the coils by any suitable push-button or switch, the coils are energized, and the alternating of the current causes the vibration of the reed 10. The polarity of the current in coils 3 and 4 is rapidly changed, the changes taking place approximately sixty times a. second on ordinary A. C. and there being approximately one hundred and twenty vibrations a second. The reed or vibrating core or buzzer, being made up of laminated springy metal, will be sensitive to the passing current in the coils and will act with great speed.

This buzzer has been successfully operated on electric light circuits and operates successfully without a transformer, and it may be operated on alternating currents of 110 voltage or more.

The normal position of the reed 10 is by its own tension against the cap 2. The pole 11 draws the reed 10 down, and, upon the changing of the alternating current, the tension throws the reed back against the cap 2. Such operation causes the noise.

The buzzer may be successfully operated with the coil 3, as shown in Fig. 3, with the coil 4 eliminated.

What I claim is,

1. A door buzzer comprising electro-magnetic coils, a combined laminated core and armature and vibrator operatively connected with said coils, and a casing enclosing said core armature and vibrator and arranged in close proximity to said vibrator.

2. A door buzzer comprising coils and a combined laminated core and armature and vibrator, one end of the laminated structure projected through one coil and slightly beyond the coil to form the pole and the other end projected through another coil and then bent and directed in a plane close to said pole.

3. A door buzzer comprising a base of non-conducting material, a laminated structure attached to said base, and coils, one end of said laminated structure being projected through one of said coils and slightly beyond the coil to form a pole and the other end projected through another coil and then end of said structure being projected 10 bent and projected in a plane close to said through another coil and bent and propole to form avibrating pole. jected in a plane close to said pole, the

4. A door buzzer comprising a base of laminations thereof being reduced gradu- 5 non-conducting material, a laminated strucally to form a Vibrating pole.

ture attached to said base, and coils, one end In im ny e eo I Set my hand this 15 of said laminated structure being projected 28th y Of February, 1923- through one of said coils and slightly beyond the coil to form a pole and the other IRA B. SANDERS. 

